Antenna quality and placement are the determining factors. I've flown from Alabama to New Mexico and back with a Stratux and a SkyRadar DX (Stratux talking to an Android, SkyRadar talking to a 740). They both performed as expected. There was lots of weather in Arkansas and Oklahoma, and both screens showed about the same thing. Occasionally both displays will show the radar as if it's been run through a shredder - imagine a radar image that a cat used to sharpen its claws. But it happens on both displays at different times and I assume it's a poor signal or interference as the image is being received (again, antenna placement). This past weekend I spend several IMC hours in Hurricane Patricia's nasty rain, and both units again performed equally well. The Stratux is prone to an occasional lockup, which could easily be due to jarring of the power connection during flight. I can let it run all night on the porch and it will stay connected to the tablet the whole time. For such a young beta product, Stratux is remarkably stable. I've added the GPS/AHRS chip and can't wait to see the AHRS work in iFly.
You really need to play around with SSHing into the Pi. If you and your buddy want to fly together and play with both Stratux's in flight, you'll want to change the SSID of one or both so you'll know which is which. You'll also want to put each one on a different wifi freq so they're not competing for attention. Both settings can be easily changed by SSH'ing into the Pi and editing the text file "/etc/hostapd/hostapd.conf". The Pi already has an editor that's a little on the 1980's look and feel side called "nano", The default userID of the Pi is... "pi". The default password is... you guessed it! "raspberry".
Apologies to ErgoMike for the topic drift! We should move the Stratux discussion back to the other forum so others can chime in.